Adding machine



2 Sheets-Sheet 1.

(No Model.)

J. F. MAYS. ADDING MAOHINB.

No. 424,932. Patented Apr. 1, 1890.

/N VENT 0f? James 1 Ways A TTOHNE rs UNITED STATES PATENT OFFICE.

JAMES F. MAYS, OF BIRMINGHAM, ALABAMA, ASSIGNOR OF ONE-HALF TO I. BERRY & CO. AND DE KALB TURBEVILLE, OF SAME PLACE.

ADDING-MACHINE,

SPECIFICATION forming part of Letters Patent No. 424,932, dated April 1, 1890.

Application filed October 1'7, 1889. Serial No. 327,372. (No model.)

To all whom it may concern: of the circumference of the frame. This Be it known that I, JAMES F. MAYS, of Birgage-arm is composed of a straight radial pormingham,in the county of Jefferson and State tion O, which extends from the center to a of Alabama, have invented a new and useful short distance beyond the circular frame, Improvement in Adding-Machines, of which and the other portion O of which gage is 55 the following is a specification. curved and has on its outer face a series of My invention is an improvement in addingnine steps or notches numbered from 1 to 9, machines designed to add two columns of fig whose faces are short sections of so many ures at the same time. radii struck from the center of the disk, and

It is an improvement upon that form of -which notches are spaced a distance apart 6o adding-machine in which a rotating disk is coinciding with the subdivisions of units on provided with numbers, arranged in a circle, the diski. 6., the radial lines from the cenfrom 1 to 100, and each number has a hole to for of the disk, which form the subdivisions receive a pencil-point, the disk having on its of units or the disk also, as they further di- I 5 face also aspiral groove, which, as the disk is verge, (see dotted lines,) coincide with the 65 rotated by successive additions, causes an infaces of the steps on the gage-arm. This dicator traveling in said groove to move up gage-arm lies normally upon the frame against and register on a scale the amounts added. a stop pin or lug a, being pulled against the My invention consists in the peculiar consame by a spring D, formed of a gum band or struction andarrangementofpartsactingupon helical wire. This arm is prevented from 70 the above general principle, which I will now rising by a hook 0, Fig. 3, on its under side proceed to describe With reference to the that hooks under the edge of the frame. drawings, in which The handle A of the frame is made hollow Figure 1 is a plan view of the instrument. or with a top and bottom plate, (see Fig. 2,)

Fig. 2 is a section of the same through line and the outer end 0 of the gage-arm O O 75 2 2. Fig. 3 is a similar section through line rests and plays between these two plates.

3 3. Fig. lis a perspective detail of the ra- The faces of these notches of the gage-arm dial part of the gage-arm, and Fig. 5 is a perare adapted to be brought against the side of spective detail of the gage-slide. the handle, so as to coincide therewith, and

A represents a circular frame having a rawhen so adjusted the number indicated by 80 dial handle A projecting from one side. The that notch represents the number of unit face of this circular frame is recessed to resubdivisions 011 the disk and frame that the ceive the adding-disk B. This disk has at its gage-arm travels over in that movement. On outer periphery a series of figures, from 1 to the part O of the arm there is an indicator- 3 5 100, spaced an equal distance apart, and each slide E, whose pointer 6 moves over a scale 6 8 5 figure or figures representing a fraction of a 011 the arm, and which indicator-slide has a hundred has a hole Z), adapted to receive a pin or stud f, Fig. 3, that passes through a pencil-point, by which it is to be rotated. longitudinal slot 9 in the arm and enters the This disk is pivoted at its center to the frame spiral groove of the disk. The distance be 0 upon a stem or axis, and the entire face of tween the figures of the scale 6' is just equal 0 said disk is wrought into a single volute spiral to the spacing of the channels or threads of cam-groove c. The edge of the circular frame the spiral groove, so that one complete rotajust outside of the disk is also provided with tion of the disk causes the spiral groove to aliquot divisions of one hundred arranged in adjust the indicator-hand e the distance of tens, as 10, 20, 30, 40, &c., and the first division one figure on the scale 6. 5 of tens is also subdivided into units, from 1 to I will now describe the general operation 10. Upon the upper face of the disk and of the device and then proceed to give the frame there plays a gage-arm C O, which is details of construction of the various parts. pivoted centrally to the axis of the disk, and Suppose the numbers to be added are (52, 37,

is arranged to swing over one-tenth portion and (54. The disk is first adjusted. so that fig- IOO ure 1 of the disk is opposite figure 1 of the frame, as shown in Fig. 1. The pencil (in the right hand) is then placed in the hole of the disk opposite of the scale on the frame A, and the face of notch number 2 on the gagearm is brought by the thumb and finger of the left hand against the handle of the frame, as shown in dotted lines, Fig. 1. The disk is then turned by the pencil in the direction of the arrow until the pencil strikes the arm C. This, it will be seen, causes the disk to be turned the distance of sixty and two subdivisions, and the figure showing at the zero-point a will be 62. To add 37 the pencil is put in the hole of the disk opposite 30 of the tens-scale on the frame and notch 7 of the gage-arm is brought against the handle. The pencil being new brought around until it strikes the gage-arm, the number on the disk opposite the zero-point a will show 99. To add (it the pencil is placed in the hole of the disk opposite 60 of the tensseale on the frame, and the notch 4; of the gage is brought against the handle and-the pencil brought around as before. The result will be 103. The 1 will be read on the hundreds-scale e of the arm by reason of the complete rotation of the disk and the movement by the cam-groove of the indicator-hand 6 one space on the scale, while the 63 will be read on the disk at the zero-point.

To add units the gage-arm need not be touched, as the pencil maybe put in the holes of the disk opposite the unit subdivisions of the first divisions in tens of the frame. In adding multiples of ten, also, the gage-arm is not used. After the first two columns of figures are added the result is set down in two figures, and the number representing hundreds is (if the example runs into higher denominations) to be carried on to the next addition of the hundreds columns. Before making an addition of the figures represent ing hundreds, however, the disk is readjusted to zero, and the number to be carried is first added in, and the two columns of hundreds and tens of hundreds are then added in the same way.

In constructing the frame A it is preferably made of sheet metal stamped to shape with an annular groove 1' near its edge just below the row of holes in the disk B, which grooved gives room for the end of the pencil to pass well through the holes in the disk and travel around in the groove. The handle A of the frame is made of two thicknesses and is chambered to form a space into which the gage-arm passes, as seen in Figs. 2 and 3, the chamber being made of a depth to receive the gage-arm, and having the front edges of the said chamber flanged to make an easy bearing for the fingers in operating the arm. The frame also has in its periphery at the zero-point two holes j, and the rotating disk has a stop-lu g 7t projeetin g from its edge. These holes j are adapted to receive the pencil in resetting the disk, the lug 71; on the disk serving to strike against the pencil when placed in said holes, and thus limit its m0- tion to the proper stopping-point.

In arranging the indicator-slide E upon the gage-arm C the edges of the latter are turned up and over to form retaining-flanges s 3, (see Fig. 4,) between which the slide E, Fig. 5, is retained. 011 one of these flanges is arranged the hundreds-scale c. The slide E has its stud or pin f attached to a flat spring 1, attached to the slide, which spring normally holds the pin down into the spiral camgroove of the disk. This pin has a knob or head at its upper end, by which it may be raised against the tension of the spring out of the cam-groove in resetting the device. A lip or flange f prevents the pin from being raised too far.

To facilitate the guiding of the pencil-point to the right hole of the disk, I construct on the outer periphery of the frame at each of the graduations by tens an inclined trough 1, whose outer end is arranged at a higher elevation, and whose inner end descends and converges to the hole of the disk opposite the figures 10,20, 30, 4-0, or other tens mark on the frame. By this construction the pencil may be quickly and without close attention placed in the pencil-guide and slipped down into the right hole of the disk, thus facilitating the work and avoiding mistakes.

Having thus described my invention, what I claim as new is- 1. The combination, with the outer frame having handle A and the rotating disk subdivided. into one hundred spacings and provided with corresponding figures and holes, and eam-groove, of a gage-arm pivoted to the center, so as to oscillate, and having at its outer end a series of notches, and an in dicatorslide arranged in the arm and adjusted by the cam-groove, substantially as shown and described.

2. The curved gage-arm C 0, having stepped notches on its outer curved surface at its outer end, in combination with the main frame A, having a chambered handle and a stop a, the disk B, the indicator-slide E, and spring for holding the arm against the stop a, substantially as shown and described.

3. The combination, with the disk B, having the spiral cam-groove, of the gage-arm C, having flanges s s and slot g, and the slide 11, having spring f, carrying pin f, extending through the slot into the ca1n-groove,substantially as shown and described.

et. The combination, with the disk B, having numbered subdivisions with corresponding holes, of the frame surrounding the same, and provided with guides for directing the pencil or stylus into the holes, as described.

JAMES F. MAYS. YVllJllGSSGS:

R. L. PATTERSON, C. M. FAY.

ITO 

